wow not bad, looks like it worked with ubuntu. then download the flash tool with .deb as ending, execute it with just double click on it, after that, you can go to console and directly start with flasher-3.5 and so on (does not need the directory of the file) also what is different, is the fact that you have to give him the full path + filename when selecting the kernel. so my example was this:

flasher-3.5 -l -b -k /home/tebsu/Desktop/kernel (because i placed my kernel directly on desktop) everything else is the same

(maybe you can add that note to the initial post so other people with the same problem have the solution direclty